Assessment of the safety reserve offered by a concrete buffer in case of a geological repository in clay

Research output: Contribution to report/book/conference proceedingsIn-proceedings paper

Institutes & Expert groups

Documents & links

Abstract

Many safety evaluations of geological repositories located in a clay formation focus on the strong contribution of the natural clay barrier to the confinement of the radionuclides present in the disposed waste. The Belgian radioactive waste management agency, ONDRAF/NIRAS, has developed a repository concept, known as 'supercontainer concept', in which the buffer surrounding the high-level waste overpacks consists of concrete. These large amounts of cementitious materials constitute an additional sorption reserve that can contribute to the long term safety of the repository. It has been shown that some anions, e.g. Cl as chloride and I as iodide, which are not or poorly retarded by the clay, are strongly sorbed upon 14 concrete phases. Other mobile anions, e.g. bicarbonate containing the radioactive isotope C, can exchange carbon isotopes with the calcite phases in the concrete.

Details

Original languageEnglish
Title of host publicationCementitious materials in safety cases for geological repositories for radioactive waste: role, evolution and interactions
Place of PublicationParis, France
Pages193-198
Publication statusPublished - Mar 2012
EventCementitious Materials in Safety Cases for Geological Repositories for Radioactive Waste: Role, Evolution and Interactions - NEA IGSC, Brussels, Belgium
Duration: 17 Nov 200920 Nov 2009

Publication series

NameNEA/RWM report
NumberNEA/RWM/R(2012)3

Conference

ConferenceCementitious Materials in Safety Cases for Geological Repositories for Radioactive Waste: Role, Evolution and Interactions
CountryBelgium
CityBrussels
Period2009-11-172009-11-20

Keywords

  • performance assessment, performance indicators, concrete, engineered barrier system, sorption

ID: 363025